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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268a4e3ae72ffc72d63252b3c625caa7ac2163a4567fa04abe334576ac8be522' 
  AND token = 'NC6GNliag/Tx9YW/rlo98h6kWeJADtH6Ko8gXcxGA9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}